package com.ziqi.hututubackend.manager;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.NumberUtil;
import cn.hutool.core.util.RandomUtil;
import com.qcloud.cos.model.PutObjectResult;
import com.qcloud.cos.model.ciModel.persistence.ImageInfo;
import com.ziqi.hututubackend.config.CosClientConfig;
import com.ziqi.hututubackend.exception.BusinessException;
import com.ziqi.hututubackend.exception.ErrorCode;
import com.ziqi.hututubackend.exception.ThrowUtils;
import com.ziqi.hututubackend.model.dto.file.UploadPictureResult;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import java.io.File;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

@Service
@Slf4j
public class FileManager {
    @Resource
    private CosClientConfig cosClientConfig;

    @Resource
    private CosManager cosManager;

    /**
     * 上传图片
     *
     * @param multipartFile 文件
     * @param uploadPathPrefix  上传路径前缀
     * @return
     */
    public UploadPictureResult uploadPicture(MultipartFile multipartFile, String uploadPathPrefix) {
        // 校验图片
        validPicture(multipartFile);
        // 图片上传地址
        String uuid = RandomUtil.randomString(16); //随机16字符的占位符
        String originFilename  = multipartFile.getOriginalFilename();
        // 设置更新后的文件名，格式化  (当前日期 + 随机字符。 + 图片后缀)
        String uploadFilename = String.format("%s_%s.%s", DateUtil.formatDate(new Date()), uuid, FileUtil.getSuffix(originFilename));
        // 设置更新后的文件路径
        String uploadPath = String.format("/%s/%s", uploadPathPrefix, uploadFilename);

        File file = null;
        try {
            //1.创建临时文件
            file = File.createTempFile(uploadPath, null);
            multipartFile.transferTo(file);
            //2.上传图片
            PutObjectResult putObjectResult = cosManager.putPictureObject(uploadPath, file);
            // 获取图片信息
            ImageInfo imageInfo = putObjectResult.getCiUploadResult().getOriginalInfo().getImageInfo();
            // 3.封装返回结果
            UploadPictureResult uploadPictureResult = new UploadPictureResult();
            uploadPictureResult.setPicName(FileUtil.mainName(originFilename));
            //设置图片宽度
            int picWidth = imageInfo.getWidth();
            uploadPictureResult.setPicWidth(picWidth);
            //设置图片高度
            int picHeight = imageInfo.getHeight();
            uploadPictureResult.setPicHeight(picHeight);
            // 计算图片比例并赋值
            double picScale = NumberUtil.round(picWidth * 1.0 / picHeight, 2).doubleValue();
            uploadPictureResult.setPicScale(picScale);
            // 图片格式
            uploadPictureResult.setPicFormat(imageInfo.getFormat());
            // 图片尺寸
            uploadPictureResult.setPicSize(FileUtil.size(file));
            // 赋值图片url地址, ----- 主机地址 + 相对地址就是绝对地址
            uploadPictureResult.setUrl(cosClientConfig.getHost() + "/" + uploadPath);
            return uploadPictureResult;

        } catch (Exception e) {
            log.error("图片上传到对象存储失败", e);
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "上传失败");
            // 上传完成后删除
        } finally {
            this.deleteTempFile(file);
        }

    }

    /**
     * 校验文件
     * @param multipartFile
     */
    private void validPicture(MultipartFile multipartFile) {
        ThrowUtils.throwIf(multipartFile == null, ErrorCode.PARAMS_ERROR, "文件不能为空");
        // 1、校验文件大小
        long fileSize = multipartFile.getSize();  //获取文件大小
        final long ONE_M = 1024 * 1024L;  //定义1m大小
        ThrowUtils.throwIf(fileSize > 2 * ONE_M, ErrorCode.PARAMS_ERROR, "文件大小不能超过2M");
        // 2、校验文件后缀
        String fileSuffix = FileUtil.getSuffix(multipartFile.getOriginalFilename()); //获取文件后缀
        // 允许上传的文件后缀
        final List<String> ALLOW_FORMAT_LIST = Arrays.asList("jpeg", "jpg", "png", "webp");
        ThrowUtils.throwIf(!ALLOW_FORMAT_LIST.contains(fileSuffix), ErrorCode.PARAMS_ERROR, "文件类型不支持");
    }

    /**
     * 删除临时文件
     * @param file
     */
    public void deleteTempFile(File file) {
        if(file == null) return;
        //删除临时文件
        boolean deleteResult = file.delete();
        if(!deleteResult) {
            log.error("文件删除失败，文件路径 = {}", file.getAbsolutePath());
        }
    }
}
